Concentration dependent colour switching of tryptophan-derived 3,5-Dinitrobenzamide (cas 121-81-3) ligands in the presence of fluoride anions
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Add time:09/06/2019 Source:sciencedirect.com
Interactions of fluoride anions with 3,5-Dinitrobenzamide (cas 121-81-3) ligands containing pendant leucine (1) and tryptophan (2) residues respectively, produced dramatic concentration-dependent switching of colour in solutions. 1H NMR spectroscopy revealed that the coordination of fluoride to 2 invoked participation of the tryptophan residue which was indicative of anion-π interactions. In addition, we have developed a chromogenic fluoride sensor from 2, immobilised in polystyrene film, which was applicable in aqueous solutions.
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